/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.8 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 02:04:18,044 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 02:04:18,047 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 02:04:18,095 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 02:04:18,095 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 02:04:18,107 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 02:04:18,109 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 02:04:18,112 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 02:04:18,115 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 02:04:18,117 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 02:04:18,120 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 02:04:18,123 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 02:04:18,123 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 02:04:18,125 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 02:04:18,127 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 02:04:18,128 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 02:04:18,131 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 02:04:18,132 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 02:04:18,134 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 02:04:18,140 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 02:04:18,143 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 02:04:18,144 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 02:04:18,146 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 02:04:18,147 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 02:04:18,151 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 02:04:18,162 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 02:04:18,163 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 02:04:18,165 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 02:04:18,165 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 02:04:18,212 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 02:04:18,212 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 02:04:18,214 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 02:04:18,214 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 02:04:18,214 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 02:04:18,215 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 02:04:18,215 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 02:04:18,215 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 02:04:18,215 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 02:04:18,216 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 02:04:18,217 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 02:04:18,217 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 02:04:18,217 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 02:04:18,217 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 02:04:18,218 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 02:04:18,218 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 02:04:18,218 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 02:04:18,218 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 02:04:18,218 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 02:04:18,219 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 02:04:18,219 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 02:04:18,219 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:04:18,219 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 02:04:18,220 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 02:04:18,220 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 02:04:18,220 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 02:04:18,220 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 02:04:18,220 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 02:04:18,220 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 02:04:18,221 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; [2020-08-19 02:04:18,575 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 02:04:18,587 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 02:04:18,590 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 02:04:18,592 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 02:04:18,592 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 02:04:18,593 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-19 02:04:18,679 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/83d51c117/862097736902476b8ad2e5ecdf965106/FLAG1a060752d [2020-08-19 02:04:19,165 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 02:04:19,166 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-19 02:04:19,172 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/83d51c117/862097736902476b8ad2e5ecdf965106/FLAG1a060752d [2020-08-19 02:04:19,508 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/83d51c117/862097736902476b8ad2e5ecdf965106 [2020-08-19 02:04:19,519 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 02:04:19,521 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 02:04:19,523 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 02:04:19,523 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 02:04:19,526 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 02:04:19,527 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:04:19" (1/1) ... [2020-08-19 02:04:19,530 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45e0ef97 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:19, skipping insertion in model container [2020-08-19 02:04:19,530 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:04:19" (1/1) ... [2020-08-19 02:04:19,537 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 02:04:19,552 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 02:04:19,719 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:04:19,727 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 02:04:19,747 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:04:19,764 INFO L208 MainTranslator]: Completed translation [2020-08-19 02:04:19,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:19 WrapperNode [2020-08-19 02:04:19,764 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 02:04:19,765 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 02:04:19,765 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 02:04:19,765 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 02:04:19,856 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:19" (1/1) ... [2020-08-19 02:04:19,856 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:19" (1/1) ... [2020-08-19 02:04:19,866 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:19" (1/1) ... [2020-08-19 02:04:19,866 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:19" (1/1) ... [2020-08-19 02:04:19,874 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:19" (1/1) ... [2020-08-19 02:04:19,880 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:19" (1/1) ... [2020-08-19 02:04:19,881 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:19" (1/1) ... [2020-08-19 02:04:19,884 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 02:04:19,884 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 02:04:19,885 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 02:04:19,885 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 02:04:19,886 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:19" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:04:19,950 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 02:04:19,950 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 02:04:19,951 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 02:04:19,951 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-19 02:04:19,951 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 02:04:19,951 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-19 02:04:19,951 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 02:04:19,951 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 02:04:19,952 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-19 02:04:19,953 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-19 02:04:19,953 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-19 02:04:19,953 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 02:04:19,953 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 02:04:19,953 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-19 02:04:19,953 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 02:04:19,954 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 02:04:19,954 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 02:04:20,259 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 02:04:20,260 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 02:04:20,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:04:20 BoogieIcfgContainer [2020-08-19 02:04:20,264 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 02:04:20,265 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 02:04:20,265 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 02:04:20,269 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 02:04:20,269 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 02:04:19" (1/3) ... [2020-08-19 02:04:20,270 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2925f5d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:04:20, skipping insertion in model container [2020-08-19 02:04:20,270 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:19" (2/3) ... [2020-08-19 02:04:20,270 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2925f5d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:04:20, skipping insertion in model container [2020-08-19 02:04:20,270 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:04:20" (3/3) ... [2020-08-19 02:04:20,272 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-19 02:04:20,284 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 02:04:20,292 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 02:04:20,307 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 02:04:20,344 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 02:04:20,344 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 02:04:20,344 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 02:04:20,345 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 02:04:20,345 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 02:04:20,345 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 02:04:20,345 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 02:04:20,345 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 02:04:20,361 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-19 02:04:20,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 02:04:20,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:20,367 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:20,367 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:20,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:20,372 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-19 02:04:20,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:20,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077624200] [2020-08-19 02:04:20,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:20,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:20,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:20,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:20,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:20,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:20,600 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:20,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077624200] [2020-08-19 02:04:20,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:04:20,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 02:04:20,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773792429] [2020-08-19 02:04:20,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:04:20,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:20,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:04:20,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:04:20,626 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-19 02:04:20,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:20,795 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-19 02:04:20,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:04:20,797 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-19 02:04:20,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:20,808 INFO L225 Difference]: With dead ends: 59 [2020-08-19 02:04:20,809 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 02:04:20,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:04:20,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 02:04:20,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-19 02:04:20,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 02:04:20,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-19 02:04:20,859 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-19 02:04:20,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:20,860 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-19 02:04:20,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:04:20,860 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-19 02:04:20,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 02:04:20,861 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:20,861 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:20,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 02:04:20,862 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:20,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:20,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-19 02:04:20,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:20,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [776305706] [2020-08-19 02:04:20,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:20,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:20,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:20,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:20,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:20,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:21,096 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:21,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [776305706] [2020-08-19 02:04:21,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:04:21,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-19 02:04:21,103 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454072850] [2020-08-19 02:04:21,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:04:21,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:21,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:04:21,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:04:21,109 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-19 02:04:21,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:21,320 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-19 02:04:21,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 02:04:21,320 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-19 02:04:21,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:21,322 INFO L225 Difference]: With dead ends: 48 [2020-08-19 02:04:21,322 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 02:04:21,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:04:21,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 02:04:21,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 02:04:21,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 02:04:21,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-19 02:04:21,332 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-19 02:04:21,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:21,333 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-19 02:04:21,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:04:21,333 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-19 02:04:21,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 02:04:21,334 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:21,334 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:21,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 02:04:21,335 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:21,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:21,336 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-19 02:04:21,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:21,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74596886] [2020-08-19 02:04:21,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:21,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:21,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:21,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:21,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:21,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:21,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:21,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74596886] [2020-08-19 02:04:21,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:21,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 02:04:21,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782793602] [2020-08-19 02:04:21,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 02:04:21,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:21,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 02:04:21,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:04:21,569 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-19 02:04:21,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:21,790 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-19 02:04:21,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 02:04:21,790 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-19 02:04:21,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:21,792 INFO L225 Difference]: With dead ends: 50 [2020-08-19 02:04:21,793 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 02:04:21,794 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:04:21,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 02:04:21,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 02:04:21,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 02:04:21,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-19 02:04:21,803 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-19 02:04:21,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:21,804 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-19 02:04:21,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 02:04:21,804 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-19 02:04:21,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 02:04:21,806 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:21,807 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:21,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 02:04:21,807 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:21,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:21,807 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-19 02:04:21,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:21,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [454751619] [2020-08-19 02:04:21,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:21,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:21,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:21,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:21,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:21,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:22,019 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:22,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [454751619] [2020-08-19 02:04:22,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:22,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 02:04:22,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681100950] [2020-08-19 02:04:22,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 02:04:22,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:22,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 02:04:22,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-19 02:04:22,022 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-19 02:04:22,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:22,188 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-19 02:04:22,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 02:04:22,189 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-19 02:04:22,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:22,190 INFO L225 Difference]: With dead ends: 52 [2020-08-19 02:04:22,190 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 02:04:22,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:04:22,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 02:04:22,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 02:04:22,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 02:04:22,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-19 02:04:22,198 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-19 02:04:22,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:22,199 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-19 02:04:22,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 02:04:22,199 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-19 02:04:22,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 02:04:22,200 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:22,200 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:22,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 02:04:22,201 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:22,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:22,201 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-19 02:04:22,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:22,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1878274535] [2020-08-19 02:04:22,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:22,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:22,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:22,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:22,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:22,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:22,507 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:22,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1878274535] [2020-08-19 02:04:22,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:22,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 02:04:22,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128884585] [2020-08-19 02:04:22,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 02:04:22,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:22,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 02:04:22,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:04:22,512 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-19 02:04:22,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:22,801 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-19 02:04:22,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 02:04:22,802 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-19 02:04:22,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:22,802 INFO L225 Difference]: With dead ends: 54 [2020-08-19 02:04:22,803 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 02:04:22,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-19 02:04:22,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 02:04:22,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 02:04:22,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 02:04:22,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-19 02:04:22,811 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-19 02:04:22,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:22,812 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-19 02:04:22,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 02:04:22,812 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-19 02:04:22,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 02:04:22,813 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:22,813 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:22,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 02:04:22,813 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:22,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:22,814 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-19 02:04:22,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:22,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1912407616] [2020-08-19 02:04:22,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:22,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:22,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:22,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:22,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:22,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:23,067 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:23,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1912407616] [2020-08-19 02:04:23,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:23,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 02:04:23,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547309902] [2020-08-19 02:04:23,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 02:04:23,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:23,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 02:04:23,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:04:23,070 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-19 02:04:23,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:23,263 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-19 02:04:23,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 02:04:23,263 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-19 02:04:23,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:23,264 INFO L225 Difference]: With dead ends: 56 [2020-08-19 02:04:23,264 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 02:04:23,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:04:23,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 02:04:23,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 02:04:23,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 02:04:23,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-19 02:04:23,277 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-19 02:04:23,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:23,277 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-19 02:04:23,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 02:04:23,278 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-19 02:04:23,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 02:04:23,280 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:23,280 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:23,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 02:04:23,281 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:23,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:23,281 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-19 02:04:23,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:23,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227693871] [2020-08-19 02:04:23,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:23,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:23,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:23,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:23,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:23,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:23,565 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:23,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227693871] [2020-08-19 02:04:23,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:23,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 02:04:23,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261224213] [2020-08-19 02:04:23,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 02:04:23,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:23,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 02:04:23,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:04:23,567 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-19 02:04:23,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:23,792 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-19 02:04:23,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 02:04:23,792 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-19 02:04:23,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:23,793 INFO L225 Difference]: With dead ends: 58 [2020-08-19 02:04:23,793 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 02:04:23,794 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-19 02:04:23,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 02:04:23,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-19 02:04:23,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 02:04:23,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-19 02:04:23,800 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-19 02:04:23,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:23,801 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-19 02:04:23,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 02:04:23,801 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-19 02:04:23,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 02:04:23,802 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:23,802 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:23,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 02:04:23,803 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:23,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:23,803 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-19 02:04:23,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:23,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1158030408] [2020-08-19 02:04:23,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:23,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:23,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:23,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:23,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:23,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:24,087 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:24,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1158030408] [2020-08-19 02:04:24,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:24,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 02:04:24,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363014260] [2020-08-19 02:04:24,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 02:04:24,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:24,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 02:04:24,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-19 02:04:24,090 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-19 02:04:24,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:24,320 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-19 02:04:24,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 02:04:24,321 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-19 02:04:24,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:24,322 INFO L225 Difference]: With dead ends: 60 [2020-08-19 02:04:24,322 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 02:04:24,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:04:24,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 02:04:24,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-19 02:04:24,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 02:04:24,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-19 02:04:24,334 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-19 02:04:24,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:24,334 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-19 02:04:24,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 02:04:24,334 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-19 02:04:24,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 02:04:24,335 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:24,336 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:24,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 02:04:24,336 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:24,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:24,337 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-19 02:04:24,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:24,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1900369810] [2020-08-19 02:04:24,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:24,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:24,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:24,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:24,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:24,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:24,739 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:24,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1900369810] [2020-08-19 02:04:24,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:24,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 02:04:24,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076764808] [2020-08-19 02:04:24,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 02:04:24,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:24,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 02:04:24,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:04:24,744 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-19 02:04:24,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:24,940 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-19 02:04:24,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 02:04:24,941 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-19 02:04:24,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:24,942 INFO L225 Difference]: With dead ends: 62 [2020-08-19 02:04:24,942 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 02:04:24,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:04:24,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 02:04:24,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-19 02:04:24,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 02:04:24,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-19 02:04:24,948 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-19 02:04:24,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:24,949 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-19 02:04:24,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 02:04:24,949 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-19 02:04:24,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 02:04:24,950 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:24,950 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:24,950 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 02:04:24,950 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:24,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:24,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-19 02:04:24,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:24,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931448149] [2020-08-19 02:04:24,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:24,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:24,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:24,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:24,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:25,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:25,345 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:25,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931448149] [2020-08-19 02:04:25,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:25,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 02:04:25,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419562368] [2020-08-19 02:04:25,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 02:04:25,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:25,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 02:04:25,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-19 02:04:25,349 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-19 02:04:25,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:25,586 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-19 02:04:25,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 02:04:25,587 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-19 02:04:25,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:25,588 INFO L225 Difference]: With dead ends: 64 [2020-08-19 02:04:25,588 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 02:04:25,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:04:25,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 02:04:25,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-19 02:04:25,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 02:04:25,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-19 02:04:25,600 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-19 02:04:25,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:25,600 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-19 02:04:25,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 02:04:25,600 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-19 02:04:25,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 02:04:25,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:25,602 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:25,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 02:04:25,603 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:25,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:25,603 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-19 02:04:25,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:25,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1393618815] [2020-08-19 02:04:25,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:25,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:25,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:25,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:25,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:25,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:25,701 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 02:04:25,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1393618815] [2020-08-19 02:04:25,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:04:25,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 02:04:25,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356216160] [2020-08-19 02:04:25,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:04:25,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:25,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:04:25,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:04:25,704 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-19 02:04:25,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:25,788 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-19 02:04:25,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:04:25,788 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-19 02:04:25,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:25,792 INFO L225 Difference]: With dead ends: 65 [2020-08-19 02:04:25,792 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 02:04:25,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:04:25,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 02:04:25,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-19 02:04:25,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 02:04:25,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-19 02:04:25,817 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-19 02:04:25,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:25,819 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-19 02:04:25,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:04:25,819 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-19 02:04:25,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 02:04:25,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:25,820 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:25,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 02:04:25,821 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:25,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:25,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-19 02:04:25,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:25,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [810979423] [2020-08-19 02:04:25,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:25,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:25,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:25,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:25,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:25,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:25,894 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 02:04:25,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [810979423] [2020-08-19 02:04:25,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:25,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 02:04:25,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824912224] [2020-08-19 02:04:25,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:04:25,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:25,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:04:25,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:04:25,896 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-19 02:04:25,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:25,989 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-19 02:04:25,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:04:25,990 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-19 02:04:25,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:25,991 INFO L225 Difference]: With dead ends: 73 [2020-08-19 02:04:25,991 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 02:04:25,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:04:25,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 02:04:25,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-19 02:04:25,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 02:04:25,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-19 02:04:25,998 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-19 02:04:25,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:25,998 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-19 02:04:25,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:04:25,998 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-19 02:04:25,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 02:04:25,999 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:25,999 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:25,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 02:04:26,000 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:26,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:26,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-19 02:04:26,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:26,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283922264] [2020-08-19 02:04:26,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:26,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:26,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:26,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:26,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:26,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:26,067 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-19 02:04:26,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283922264] [2020-08-19 02:04:26,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:04:26,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 02:04:26,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505407475] [2020-08-19 02:04:26,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:04:26,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:26,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:04:26,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:04:26,069 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-19 02:04:26,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:26,151 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-19 02:04:26,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:04:26,151 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-19 02:04:26,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:26,152 INFO L225 Difference]: With dead ends: 69 [2020-08-19 02:04:26,153 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 02:04:26,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:04:26,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 02:04:26,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 02:04:26,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 02:04:26,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-19 02:04:26,159 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-19 02:04:26,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:26,159 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-19 02:04:26,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:04:26,159 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-19 02:04:26,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 02:04:26,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:26,161 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:26,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 02:04:26,161 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:26,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:26,161 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-19 02:04:26,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:26,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [406380007] [2020-08-19 02:04:26,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:26,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:26,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:26,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:26,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:26,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:26,623 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:26,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [406380007] [2020-08-19 02:04:26,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:26,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 02:04:26,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750124732] [2020-08-19 02:04:26,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 02:04:26,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:26,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 02:04:26,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:04:26,628 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-19 02:04:26,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:26,851 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-19 02:04:26,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 02:04:26,852 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-19 02:04:26,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:26,853 INFO L225 Difference]: With dead ends: 74 [2020-08-19 02:04:26,853 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 02:04:26,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-19 02:04:26,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 02:04:26,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-19 02:04:26,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 02:04:26,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-19 02:04:26,866 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-19 02:04:26,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:26,866 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-19 02:04:26,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 02:04:26,866 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-19 02:04:26,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 02:04:26,867 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:26,867 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:26,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 02:04:26,868 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:26,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:26,868 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-19 02:04:26,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:26,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694450194] [2020-08-19 02:04:26,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:26,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:26,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:26,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:26,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:26,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:27,371 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:27,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1694450194] [2020-08-19 02:04:27,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:27,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 02:04:27,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475228007] [2020-08-19 02:04:27,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 02:04:27,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:27,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 02:04:27,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:04:27,374 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-19 02:04:27,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:27,591 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-19 02:04:27,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 02:04:27,591 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-19 02:04:27,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:27,592 INFO L225 Difference]: With dead ends: 76 [2020-08-19 02:04:27,592 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 02:04:27,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:04:27,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 02:04:27,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-19 02:04:27,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 02:04:27,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-19 02:04:27,599 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-19 02:04:27,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:27,599 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-19 02:04:27,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 02:04:27,600 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-19 02:04:27,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 02:04:27,600 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:27,600 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:27,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 02:04:27,601 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:27,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:27,601 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-19 02:04:27,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:27,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812089073] [2020-08-19 02:04:27,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:27,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:27,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:27,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:27,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:27,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:28,230 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:28,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812089073] [2020-08-19 02:04:28,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:28,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 02:04:28,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195933455] [2020-08-19 02:04:28,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 02:04:28,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:28,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 02:04:28,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:04:28,235 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-19 02:04:28,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:28,462 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-19 02:04:28,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 02:04:28,463 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-19 02:04:28,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:28,463 INFO L225 Difference]: With dead ends: 78 [2020-08-19 02:04:28,463 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 02:04:28,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:04:28,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 02:04:28,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-19 02:04:28,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 02:04:28,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-19 02:04:28,474 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-19 02:04:28,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:28,474 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-19 02:04:28,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 02:04:28,474 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-19 02:04:28,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 02:04:28,476 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:28,476 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:28,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 02:04:28,476 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:28,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:28,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-19 02:04:28,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:28,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [231833185] [2020-08-19 02:04:28,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:28,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:28,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:28,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:28,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:28,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:29,051 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:29,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [231833185] [2020-08-19 02:04:29,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:29,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 02:04:29,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101333727] [2020-08-19 02:04:29,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 02:04:29,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:29,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 02:04:29,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-19 02:04:29,054 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-19 02:04:29,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:29,310 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-19 02:04:29,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 02:04:29,311 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-19 02:04:29,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:29,312 INFO L225 Difference]: With dead ends: 80 [2020-08-19 02:04:29,312 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 02:04:29,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:04:29,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 02:04:29,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-19 02:04:29,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 02:04:29,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-19 02:04:29,317 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-19 02:04:29,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:29,318 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-19 02:04:29,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 02:04:29,318 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-19 02:04:29,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 02:04:29,318 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:29,319 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:29,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 02:04:29,319 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:29,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:29,319 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-19 02:04:29,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:29,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1220960062] [2020-08-19 02:04:29,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:29,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:29,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:29,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:29,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:29,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:29,906 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:29,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1220960062] [2020-08-19 02:04:29,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:29,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 02:04:29,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199706435] [2020-08-19 02:04:29,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 02:04:29,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:29,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 02:04:29,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:04:29,909 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-19 02:04:30,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:30,153 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-19 02:04:30,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 02:04:30,157 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-19 02:04:30,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:30,158 INFO L225 Difference]: With dead ends: 82 [2020-08-19 02:04:30,158 INFO L226 Difference]: Without dead ends: 60 [2020-08-19 02:04:30,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-19 02:04:30,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-19 02:04:30,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-19 02:04:30,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 02:04:30,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-19 02:04:30,163 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-19 02:04:30,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:30,164 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-19 02:04:30,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 02:04:30,164 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-19 02:04:30,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 02:04:30,164 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:30,164 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:30,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 02:04:30,165 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:30,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:30,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-19 02:04:30,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:30,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [911772250] [2020-08-19 02:04:30,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:30,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:30,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:30,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:30,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:30,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:30,865 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:30,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [911772250] [2020-08-19 02:04:30,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:30,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 02:04:30,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515151507] [2020-08-19 02:04:30,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 02:04:30,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:30,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 02:04:30,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:04:30,867 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-19 02:04:31,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:31,145 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-19 02:04:31,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 02:04:31,145 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-19 02:04:31,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:31,146 INFO L225 Difference]: With dead ends: 84 [2020-08-19 02:04:31,146 INFO L226 Difference]: Without dead ends: 62 [2020-08-19 02:04:31,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:04:31,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-19 02:04:31,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-19 02:04:31,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-19 02:04:31,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-19 02:04:31,152 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-19 02:04:31,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:31,152 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-19 02:04:31,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 02:04:31,153 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-19 02:04:31,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 02:04:31,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:31,153 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:31,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 02:04:31,154 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:31,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:31,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-19 02:04:31,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:31,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72192433] [2020-08-19 02:04:31,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:31,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:31,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:31,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:31,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:31,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:31,929 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:31,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [72192433] [2020-08-19 02:04:31,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:31,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 02:04:31,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807722795] [2020-08-19 02:04:31,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 02:04:31,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:31,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 02:04:31,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:04:31,933 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-19 02:04:32,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:32,134 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-19 02:04:32,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 02:04:32,134 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-19 02:04:32,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:32,135 INFO L225 Difference]: With dead ends: 86 [2020-08-19 02:04:32,135 INFO L226 Difference]: Without dead ends: 64 [2020-08-19 02:04:32,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-19 02:04:32,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-19 02:04:32,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-19 02:04:32,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-19 02:04:32,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-19 02:04:32,147 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-19 02:04:32,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:32,147 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-19 02:04:32,147 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 02:04:32,147 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-19 02:04:32,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 02:04:32,148 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:32,148 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:32,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 02:04:32,150 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:32,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:32,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-19 02:04:32,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:32,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1104117657] [2020-08-19 02:04:32,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:32,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:32,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:32,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:32,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:32,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:32,960 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:32,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1104117657] [2020-08-19 02:04:32,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:32,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 02:04:32,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514232702] [2020-08-19 02:04:32,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 02:04:32,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:32,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 02:04:32,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-19 02:04:32,964 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-19 02:04:33,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:33,266 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-19 02:04:33,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 02:04:33,267 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-19 02:04:33,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:33,268 INFO L225 Difference]: With dead ends: 88 [2020-08-19 02:04:33,268 INFO L226 Difference]: Without dead ends: 66 [2020-08-19 02:04:33,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:04:33,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-19 02:04:33,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-19 02:04:33,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-19 02:04:33,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-19 02:04:33,274 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-19 02:04:33,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:33,275 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-19 02:04:33,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 02:04:33,275 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-19 02:04:33,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-19 02:04:33,275 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:33,276 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:33,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 02:04:33,276 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:33,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:33,276 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-19 02:04:33,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:33,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1743465662] [2020-08-19 02:04:33,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:33,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:33,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:33,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:33,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:33,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:34,321 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:34,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1743465662] [2020-08-19 02:04:34,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:34,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 02:04:34,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268642189] [2020-08-19 02:04:34,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 02:04:34,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:34,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 02:04:34,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:04:34,325 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-19 02:04:34,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:34,622 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-19 02:04:34,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 02:04:34,624 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-19 02:04:34,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:34,625 INFO L225 Difference]: With dead ends: 90 [2020-08-19 02:04:34,625 INFO L226 Difference]: Without dead ends: 68 [2020-08-19 02:04:34,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-19 02:04:34,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-19 02:04:34,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-19 02:04:34,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-19 02:04:34,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-19 02:04:34,632 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-19 02:04:34,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:34,633 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-19 02:04:34,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 02:04:34,633 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-19 02:04:34,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-19 02:04:34,634 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:34,634 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:34,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 02:04:34,635 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:34,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:34,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-19 02:04:34,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:34,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [795355947] [2020-08-19 02:04:34,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:34,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:34,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:34,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:34,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:34,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:35,557 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:35,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [795355947] [2020-08-19 02:04:35,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:35,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 02:04:35,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663332735] [2020-08-19 02:04:35,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 02:04:35,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:35,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 02:04:35,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-19 02:04:35,560 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-19 02:04:35,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:35,831 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-19 02:04:35,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 02:04:35,832 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-19 02:04:35,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:35,833 INFO L225 Difference]: With dead ends: 92 [2020-08-19 02:04:35,833 INFO L226 Difference]: Without dead ends: 70 [2020-08-19 02:04:35,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-19 02:04:35,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-19 02:04:35,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-19 02:04:35,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-19 02:04:35,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-19 02:04:35,838 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-19 02:04:35,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:35,839 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-19 02:04:35,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 02:04:35,839 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-19 02:04:35,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-19 02:04:35,839 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:35,840 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:35,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 02:04:35,840 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:35,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:35,840 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-19 02:04:35,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:35,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118821036] [2020-08-19 02:04:35,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:35,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:35,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:35,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:35,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:35,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:36,821 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:36,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118821036] [2020-08-19 02:04:36,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:36,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 02:04:36,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129951434] [2020-08-19 02:04:36,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 02:04:36,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:36,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 02:04:36,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:04:36,823 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-19 02:04:37,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:37,150 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-19 02:04:37,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 02:04:37,150 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-19 02:04:37,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:37,151 INFO L225 Difference]: With dead ends: 94 [2020-08-19 02:04:37,152 INFO L226 Difference]: Without dead ends: 72 [2020-08-19 02:04:37,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-19 02:04:37,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-19 02:04:37,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-19 02:04:37,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-19 02:04:37,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-19 02:04:37,158 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-19 02:04:37,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:37,158 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-19 02:04:37,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 02:04:37,158 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-19 02:04:37,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-19 02:04:37,159 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:37,159 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:37,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 02:04:37,159 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:37,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:37,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-19 02:04:37,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:37,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2063567057] [2020-08-19 02:04:37,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:37,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:37,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:37,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:37,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:37,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:38,165 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:38,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2063567057] [2020-08-19 02:04:38,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:38,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 02:04:38,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030951895] [2020-08-19 02:04:38,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 02:04:38,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:38,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 02:04:38,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-19 02:04:38,167 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-19 02:04:38,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:38,535 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-19 02:04:38,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 02:04:38,535 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-19 02:04:38,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:38,536 INFO L225 Difference]: With dead ends: 96 [2020-08-19 02:04:38,536 INFO L226 Difference]: Without dead ends: 74 [2020-08-19 02:04:38,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-19 02:04:38,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-19 02:04:38,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-19 02:04:38,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-19 02:04:38,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-19 02:04:38,541 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-19 02:04:38,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:38,541 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-19 02:04:38,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 02:04:38,541 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-19 02:04:38,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-19 02:04:38,542 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:38,542 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:38,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 02:04:38,542 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:38,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:38,543 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-19 02:04:38,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:38,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [706394886] [2020-08-19 02:04:38,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:38,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:38,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:38,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:38,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:38,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:39,633 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:39,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [706394886] [2020-08-19 02:04:39,633 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:39,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 02:04:39,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291318358] [2020-08-19 02:04:39,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 02:04:39,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:39,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 02:04:39,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-19 02:04:39,636 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-19 02:04:39,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:39,866 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-19 02:04:39,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 02:04:39,866 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-19 02:04:39,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:39,867 INFO L225 Difference]: With dead ends: 98 [2020-08-19 02:04:39,867 INFO L226 Difference]: Without dead ends: 76 [2020-08-19 02:04:39,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-19 02:04:39,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-19 02:04:39,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-19 02:04:39,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-19 02:04:39,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-19 02:04:39,872 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-19 02:04:39,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:39,872 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-19 02:04:39,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 02:04:39,872 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-19 02:04:39,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-19 02:04:39,873 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:39,873 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:39,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 02:04:39,873 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:39,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:39,874 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-19 02:04:39,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:39,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268768899] [2020-08-19 02:04:39,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:39,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:39,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:39,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:39,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:39,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:41,074 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:41,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268768899] [2020-08-19 02:04:41,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:41,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 02:04:41,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146001130] [2020-08-19 02:04:41,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 02:04:41,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:41,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 02:04:41,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-19 02:04:41,076 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-19 02:04:41,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:41,413 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-19 02:04:41,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 02:04:41,413 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-19 02:04:41,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:41,415 INFO L225 Difference]: With dead ends: 100 [2020-08-19 02:04:41,415 INFO L226 Difference]: Without dead ends: 78 [2020-08-19 02:04:41,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-19 02:04:41,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-19 02:04:41,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-19 02:04:41,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-19 02:04:41,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-19 02:04:41,420 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-19 02:04:41,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:41,421 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-19 02:04:41,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 02:04:41,421 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-19 02:04:41,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-19 02:04:41,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:41,422 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:41,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 02:04:41,422 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:41,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:41,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-19 02:04:41,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:41,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898487782] [2020-08-19 02:04:41,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:41,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:41,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:41,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:41,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:41,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:42,689 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:42,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898487782] [2020-08-19 02:04:42,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:42,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 02:04:42,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662259354] [2020-08-19 02:04:42,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 02:04:42,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:42,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 02:04:42,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-19 02:04:42,691 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-19 02:04:43,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:43,089 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-19 02:04:43,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 02:04:43,091 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-19 02:04:43,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:43,092 INFO L225 Difference]: With dead ends: 102 [2020-08-19 02:04:43,092 INFO L226 Difference]: Without dead ends: 80 [2020-08-19 02:04:43,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-19 02:04:43,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-19 02:04:43,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-19 02:04:43,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-19 02:04:43,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-19 02:04:43,101 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-19 02:04:43,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:43,101 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-19 02:04:43,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 02:04:43,101 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-19 02:04:43,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-19 02:04:43,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:43,102 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:43,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 02:04:43,102 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:43,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:43,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-19 02:04:43,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:43,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [787985544] [2020-08-19 02:04:43,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:43,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:43,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:43,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:43,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:43,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:44,453 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:44,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [787985544] [2020-08-19 02:04:44,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:44,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 02:04:44,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117463187] [2020-08-19 02:04:44,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 02:04:44,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:44,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 02:04:44,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-19 02:04:44,455 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-19 02:04:44,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:44,754 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-19 02:04:44,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 02:04:44,755 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-19 02:04:44,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:44,756 INFO L225 Difference]: With dead ends: 104 [2020-08-19 02:04:44,756 INFO L226 Difference]: Without dead ends: 82 [2020-08-19 02:04:44,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:04:44,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-19 02:04:44,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-19 02:04:44,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-19 02:04:44,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-19 02:04:44,761 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-19 02:04:44,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:44,761 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-19 02:04:44,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 02:04:44,761 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-19 02:04:44,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-19 02:04:44,762 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:44,762 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:44,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 02:04:44,762 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:44,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:44,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-19 02:04:44,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:44,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640315528] [2020-08-19 02:04:44,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:44,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:44,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:44,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:44,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:44,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:46,143 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:46,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640315528] [2020-08-19 02:04:46,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:46,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 02:04:46,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10633519] [2020-08-19 02:04:46,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 02:04:46,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:46,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 02:04:46,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-19 02:04:46,145 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-19 02:04:46,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:46,558 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-19 02:04:46,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 02:04:46,559 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-19 02:04:46,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:46,560 INFO L225 Difference]: With dead ends: 106 [2020-08-19 02:04:46,560 INFO L226 Difference]: Without dead ends: 84 [2020-08-19 02:04:46,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 02:04:46,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-19 02:04:46,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-19 02:04:46,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-19 02:04:46,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-19 02:04:46,566 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-19 02:04:46,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:46,567 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-19 02:04:46,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 02:04:46,567 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-19 02:04:46,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-19 02:04:46,568 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:46,568 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:46,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 02:04:46,568 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:46,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:46,568 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-19 02:04:46,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:46,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [426561305] [2020-08-19 02:04:46,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:46,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:46,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:46,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:46,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:46,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:48,015 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:48,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [426561305] [2020-08-19 02:04:48,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:48,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 02:04:48,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098708112] [2020-08-19 02:04:48,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 02:04:48,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:48,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 02:04:48,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-19 02:04:48,016 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-19 02:04:48,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:48,452 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-19 02:04:48,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 02:04:48,453 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-19 02:04:48,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:48,454 INFO L225 Difference]: With dead ends: 108 [2020-08-19 02:04:48,454 INFO L226 Difference]: Without dead ends: 86 [2020-08-19 02:04:48,455 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 02:04:48,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-19 02:04:48,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-19 02:04:48,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-19 02:04:48,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-19 02:04:48,460 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-19 02:04:48,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:48,460 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-19 02:04:48,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 02:04:48,460 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-19 02:04:48,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-19 02:04:48,461 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:48,461 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:48,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 02:04:48,461 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:48,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:48,462 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-19 02:04:48,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:48,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1038843577] [2020-08-19 02:04:48,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:48,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:48,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:48,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:48,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:48,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:49,960 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:49,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1038843577] [2020-08-19 02:04:49,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:49,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 02:04:49,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56127202] [2020-08-19 02:04:49,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 02:04:49,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:49,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 02:04:49,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:04:49,963 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-19 02:04:50,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:50,388 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-19 02:04:50,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 02:04:50,389 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-19 02:04:50,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:50,390 INFO L225 Difference]: With dead ends: 110 [2020-08-19 02:04:50,390 INFO L226 Difference]: Without dead ends: 88 [2020-08-19 02:04:50,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 02:04:50,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-19 02:04:50,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-19 02:04:50,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-19 02:04:50,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-19 02:04:50,395 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-19 02:04:50,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:50,395 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-19 02:04:50,396 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 02:04:50,396 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-19 02:04:50,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-19 02:04:50,396 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:50,396 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:50,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 02:04:50,397 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:50,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:50,397 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-19 02:04:50,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:50,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [93441522] [2020-08-19 02:04:50,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:50,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:50,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:50,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:50,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:50,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:51,976 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:51,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [93441522] [2020-08-19 02:04:51,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:51,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 02:04:51,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898303880] [2020-08-19 02:04:51,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 02:04:51,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:51,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 02:04:51,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 02:04:51,979 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-19 02:04:52,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:52,459 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-19 02:04:52,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 02:04:52,460 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-19 02:04:52,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:52,461 INFO L225 Difference]: With dead ends: 112 [2020-08-19 02:04:52,461 INFO L226 Difference]: Without dead ends: 90 [2020-08-19 02:04:52,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:04:52,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-19 02:04:52,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-19 02:04:52,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-19 02:04:52,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-19 02:04:52,467 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-19 02:04:52,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:52,468 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-19 02:04:52,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 02:04:52,468 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-19 02:04:52,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-19 02:04:52,468 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:52,468 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:52,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 02:04:52,469 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:52,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:52,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-19 02:04:52,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:52,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591504798] [2020-08-19 02:04:52,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:52,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:52,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:52,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:52,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:52,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:54,187 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:54,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591504798] [2020-08-19 02:04:54,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:54,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 02:04:54,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504851901] [2020-08-19 02:04:54,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 02:04:54,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:54,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 02:04:54,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 02:04:54,189 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-19 02:04:54,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:54,645 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-19 02:04:54,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 02:04:54,646 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-19 02:04:54,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:54,647 INFO L225 Difference]: With dead ends: 114 [2020-08-19 02:04:54,647 INFO L226 Difference]: Without dead ends: 92 [2020-08-19 02:04:54,649 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 02:04:54,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-19 02:04:54,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-19 02:04:54,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-19 02:04:54,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-19 02:04:54,654 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-19 02:04:54,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:54,654 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-19 02:04:54,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 02:04:54,655 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-19 02:04:54,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-19 02:04:54,655 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:54,656 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:54,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 02:04:54,656 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:54,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:54,656 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-19 02:04:54,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:54,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [918188738] [2020-08-19 02:04:54,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:54,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:54,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:54,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:54,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:54,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:56,439 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:56,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [918188738] [2020-08-19 02:04:56,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:56,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 02:04:56,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49373264] [2020-08-19 02:04:56,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 02:04:56,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:56,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 02:04:56,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 02:04:56,441 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-19 02:04:56,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:56,802 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-19 02:04:56,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 02:04:56,802 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-19 02:04:56,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:56,804 INFO L225 Difference]: With dead ends: 116 [2020-08-19 02:04:56,804 INFO L226 Difference]: Without dead ends: 94 [2020-08-19 02:04:56,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 02:04:56,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-19 02:04:56,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-19 02:04:56,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-19 02:04:56,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-19 02:04:56,810 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-19 02:04:56,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:56,810 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-19 02:04:56,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 02:04:56,811 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-19 02:04:56,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-19 02:04:56,811 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:56,812 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:56,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 02:04:56,812 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:56,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:56,812 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-19 02:04:56,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:56,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763697572] [2020-08-19 02:04:56,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:56,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:56,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:56,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:56,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:56,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:58,675 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:04:58,676 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763697572] [2020-08-19 02:04:58,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:58,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 02:04:58,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436039686] [2020-08-19 02:04:58,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 02:04:58,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:58,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 02:04:58,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:04:58,677 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-19 02:04:59,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:59,170 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-19 02:04:59,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 02:04:59,171 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-19 02:04:59,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:59,172 INFO L225 Difference]: With dead ends: 118 [2020-08-19 02:04:59,172 INFO L226 Difference]: Without dead ends: 96 [2020-08-19 02:04:59,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 02:04:59,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-19 02:04:59,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-19 02:04:59,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-19 02:04:59,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-19 02:04:59,178 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-19 02:04:59,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:59,178 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-19 02:04:59,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 02:04:59,179 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-19 02:04:59,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-19 02:04:59,179 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:59,179 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:59,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 02:04:59,179 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:59,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:59,180 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-19 02:04:59,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:59,180 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [25092369] [2020-08-19 02:04:59,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:59,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:59,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:59,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:59,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:04:59,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:01,189 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:05:01,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [25092369] [2020-08-19 02:05:01,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:01,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 02:05:01,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378659850] [2020-08-19 02:05:01,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 02:05:01,190 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:01,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 02:05:01,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 02:05:01,191 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-19 02:05:01,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:01,672 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-19 02:05:01,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 02:05:01,673 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-19 02:05:01,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:01,674 INFO L225 Difference]: With dead ends: 120 [2020-08-19 02:05:01,674 INFO L226 Difference]: Without dead ends: 98 [2020-08-19 02:05:01,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 02:05:01,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-19 02:05:01,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-19 02:05:01,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-19 02:05:01,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-19 02:05:01,680 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-19 02:05:01,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:01,681 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-19 02:05:01,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 02:05:01,681 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-19 02:05:01,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-19 02:05:01,682 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:01,682 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:01,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 02:05:01,682 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:01,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:01,683 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-19 02:05:01,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:01,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733449628] [2020-08-19 02:05:01,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:01,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:01,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:01,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:01,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:05:01,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:03,824 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:05:03,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733449628] [2020-08-19 02:05:03,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:03,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 02:05:03,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389673311] [2020-08-19 02:05:03,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 02:05:03,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:03,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 02:05:03,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 02:05:03,836 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-19 02:05:04,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:04,217 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-19 02:05:04,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 02:05:04,217 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-19 02:05:04,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:04,219 INFO L225 Difference]: With dead ends: 122 [2020-08-19 02:05:04,219 INFO L226 Difference]: Without dead ends: 100 [2020-08-19 02:05:04,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 02:05:04,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-19 02:05:04,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-19 02:05:04,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-19 02:05:04,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-19 02:05:04,225 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-19 02:05:04,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:04,225 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-19 02:05:04,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 02:05:04,225 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-19 02:05:04,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-19 02:05:04,226 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:04,226 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:04,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 02:05:04,227 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:04,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:04,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-19 02:05:04,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:04,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1591501054] [2020-08-19 02:05:04,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:04,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:04,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:04,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:04,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:05:04,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:06,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:05:06,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1591501054] [2020-08-19 02:05:06,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:06,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 02:05:06,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081432707] [2020-08-19 02:05:06,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 02:05:06,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:06,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 02:05:06,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 02:05:06,639 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-19 02:05:06,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:06,971 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-19 02:05:06,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 02:05:06,971 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-19 02:05:06,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:06,972 INFO L225 Difference]: With dead ends: 124 [2020-08-19 02:05:06,973 INFO L226 Difference]: Without dead ends: 102 [2020-08-19 02:05:06,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 02:05:06,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-19 02:05:06,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-19 02:05:06,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-19 02:05:06,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-19 02:05:06,979 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-19 02:05:06,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:06,979 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-19 02:05:06,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 02:05:06,979 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-19 02:05:06,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-19 02:05:06,980 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:06,980 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:06,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 02:05:06,980 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:06,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:06,981 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-19 02:05:06,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:06,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568015256] [2020-08-19 02:05:06,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:07,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:07,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:07,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:07,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:05:07,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:09,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:05:09,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568015256] [2020-08-19 02:05:09,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:09,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 02:05:09,297 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881736432] [2020-08-19 02:05:09,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 02:05:09,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:09,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 02:05:09,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 02:05:09,299 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-19 02:05:09,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:09,654 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-19 02:05:09,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 02:05:09,655 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-19 02:05:09,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:09,656 INFO L225 Difference]: With dead ends: 126 [2020-08-19 02:05:09,656 INFO L226 Difference]: Without dead ends: 104 [2020-08-19 02:05:09,657 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 02:05:09,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-19 02:05:09,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-19 02:05:09,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-19 02:05:09,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-19 02:05:09,662 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-19 02:05:09,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:09,662 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-19 02:05:09,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 02:05:09,662 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-19 02:05:09,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-19 02:05:09,663 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:09,663 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:09,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 02:05:09,663 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:09,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:09,664 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-19 02:05:09,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:09,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [978361350] [2020-08-19 02:05:09,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:09,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:09,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:09,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:09,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:05:09,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:12,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:05:12,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [978361350] [2020-08-19 02:05:12,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:12,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 02:05:12,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125572087] [2020-08-19 02:05:12,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 02:05:12,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:12,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 02:05:12,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 02:05:12,074 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-19 02:05:12,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:12,532 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-19 02:05:12,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 02:05:12,533 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-19 02:05:12,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:12,534 INFO L225 Difference]: With dead ends: 128 [2020-08-19 02:05:12,534 INFO L226 Difference]: Without dead ends: 106 [2020-08-19 02:05:12,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 02:05:12,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-19 02:05:12,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-19 02:05:12,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-19 02:05:12,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-19 02:05:12,543 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-19 02:05:12,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:12,543 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-19 02:05:12,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 02:05:12,544 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-19 02:05:12,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-19 02:05:12,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:12,544 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:12,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 02:05:12,545 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:12,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:12,545 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-19 02:05:12,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:12,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155547740] [2020-08-19 02:05:12,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:12,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:12,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:12,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:12,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:05:12,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:15,060 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:05:15,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155547740] [2020-08-19 02:05:15,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:15,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 02:05:15,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635229644] [2020-08-19 02:05:15,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 02:05:15,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:15,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 02:05:15,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 02:05:15,062 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-19 02:05:15,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:15,634 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-19 02:05:15,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 02:05:15,634 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-19 02:05:15,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:15,635 INFO L225 Difference]: With dead ends: 130 [2020-08-19 02:05:15,635 INFO L226 Difference]: Without dead ends: 108 [2020-08-19 02:05:15,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 02:05:15,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-19 02:05:15,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-19 02:05:15,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-19 02:05:15,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-19 02:05:15,644 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-19 02:05:15,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:15,644 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-19 02:05:15,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 02:05:15,645 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-19 02:05:15,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-19 02:05:15,647 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:15,648 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:15,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 02:05:15,648 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:15,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:15,649 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-19 02:05:15,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:15,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875173002] [2020-08-19 02:05:15,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:15,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:15,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:15,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:15,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:05:15,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat